Presentation of a Four-Quadrant Converter Based System in Traction Applications – Reference to Modeling, Simulation and Analysis

This paper describes the development of an improved four-quadrant converter simulation model for AC traction drives. The functions of each of the major components of the system have been analyzed and the parameters of the model have been chosen in a way to enable building the model using IGBT modules with blocking voltage of 3.3 kV. It has also been developed the simulation model of the complete energy circuit and respective control-regulation structure which encompasses: 25 kV traction system, transformer model with magnetic coupling, control and regulation structure, real parameter influence of IGBT module with respect to switching losses and forward losses of IGBT and diode. The model is constructed using SIMPLORER/Schematic graphical simulation platform. Experimental results are also presented to verify the analysis and they have been recorded from the model.